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[Exempt]

What this does it hooks the decrypt method inside a game called Xenimus and reads the packets that the game recieves. I'm pretty new to DLLs and hooking so i was wondering if someone could inform me on how this would be implentment into my code and how to read the information this this dll gathers from the data. The main goal here is to get items information on the ground so i know exactly where good items drop.

Edit: I forgot to mention it uses a imclude called detours.h, I looked that up and stuff but that is something i've never heard of till this.

#include "windows.h"

#include "detours.h"


#include <cstdio>


typedef int (__thiscall* DecryptCall)(void* pthis, unsigned char* buffer, int length);

typedef int (__thiscall* EncryptCall)(void* pthis, unsigned char* buffer, int length);


DecryptCall decrypt = (DecryptCall)0x418F20;

EncryptCall encrypt = (EncryptCall)0x418E50;


FILE* flog = NULL;


class DetouredClass 

{

public:

	int DetourDecrypt(unsigned char* buffer, int len)

	{

		//call real decrypt

		int decryptres = decrypt(this, buffer, len);


		if (buffer[0] == 0x49)

			return decryptres;


		unsigned char* tmpbuf = new unsigned char[len - 1];

		tmpbuf[0] = buffer[0];

		memcpy(&tmpbuf[1], &buffer[2], len - 2);


		printf("S -> C: OP %02X, len %u\n", buffer[0], len - 1);


		fprintf(flog, "\r\nS -> C: OP %02X, len %u\r\n", buffer[0], len - 1);

		WriteToFile(flog, tmpbuf, len - 1);


		delete[] tmpbuf;


		return decryptres;

	}


	int DetourEncrypt(unsigned char* buffer, int len)

	{

		printf("C -> S: OP %02X, len %u\n", buffer[0], len - 1);


		unsigned char* tmpbuf = new unsigned char[len - 1];

		tmpbuf[0] = buffer[0];

		memcpy(&tmpbuf[1], &buffer[2], len - 2);


		fprintf(flog, "\r\nC -> S: OP %02X, len %u\r\n", buffer[0], len - 1);

		WriteToFile(flog, tmpbuf, len - 1);


		delete[] tmpbuf;


		return encrypt(this, buffer, len); //dont do anything yet, for later

	}


	size_t WriteToFile(FILE *dstFile, const void *pSource, size_t sourceLength)

	{

		fprintf(dstFile, "|------------------------------------------------|----------------|\r\n");

		fprintf(dstFile, "|00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F |0123456789ABCDEF|\r\n");

		fprintf(dstFile, "|------------------------------------------------|----------------|\r\n");


		size_t i = 0;

		size_t c = 0;

		size_t start;

		size_t written;

		unsigned char byte;

		const unsigned char *pData = (const unsigned char *)pSource;


		for( ; i < sourceLength; )

		{

			start = i;

			fprintf(dstFile, "|");

			for( c = 0; c < 16 && i < sourceLength; )		// write 16 bytes per line

			{

				fprintf(dstFile, "%02X ", (int)pData[i]);

				++i; ++c;

			}


			written = c;

			for( ; c < 16; ++c )							// finish off any incomplete bytes

				fprintf(dstFile, "   ");


			// write the text part

			fprintf(dstFile, "|");

			for( c = 0; c < written; ++c )

			{

				byte = pData[start + c];

				if( isprint((int)byte) )

					fprintf(dstFile, "%c", (int)byte);

				else

					fprintf(dstFile, ".");

			}


			for( ; c < 16; ++c )

				fprintf(dstFile, " ");


			fprintf(dstFile, "|\r\n");

		}


		fprintf(dstFile, "-------------------------------------------------------------------\r\n");

		return 0;

	}

};


BOOL APIENTRY DllMain(HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)

{

	if (ul_reason_for_call == DLL_PROCESS_ATTACH)

	{

		DetourTransactionBegin();

		DetourUpdateThread(GetCurrentThread());


		DetourAttach((PVOID*)&decrypt, (PVOID)(&(PVOID&)DetouredClass::DetourDecrypt));

		DetourAttach((PVOID*)&encrypt, (PVOID)(&(PVOID&)DetouredClass::DetourEncrypt));


		LONG l = DetourTransactionCommit();


		AllocConsole();


		freopen("CONIN$", "r", stdin);

		freopen("CONOUT$", "w", stdout);

		freopen("CONOUT$", "w", stderr);


		SetConsoleTitle("TestWindow");

		HWND wnd = GetConsoleWindow();

		RemoveMenu(GetSystemMenu(wnd, FALSE), SC_CLOSE, MF_BYCOMMAND);


		unsigned int ext = 0;

		FILE* f = fopen("Log.txt", "rb");


		if (f != NULL)

		{

			fclose(f);


			ext = 1;


			while (true)

			{

				char filename[1024];

				sprintf(filename, "Log%u.txt", ext);


				f = fopen(filename, "rb");


				if (f == NULL)

					break;

				fclose(f);

				++ext;

			}

		}


		char logfile[1024];

		if (ext == 0)

			strcpy(logfile, "Log.txt");

		else

			sprintf(logfile, "Log%u.txt", ext);


		flog = fopen(logfile, "wb");

	}


	return TRUE;

}